Heavy-duty high-speed steel bridge reamers, also known as construction reamers, are used to align existing holes and enlarge undersized holes before installing bolts or rivets. Our 3/4inch reamer bits align and enlarge pre-drilled holes ready for bolting Makes reaming easier than using a large drill bit, and the reaming is smooth and tear-free. But before using our 3/4inch bridge/construction reamers, there must be an existing hole or pilot hole smaller than 3/4inch. The tapered point design allows the reamer bit to enter non-linear, overlapping holes to align bolt holes. Enlarge the holes in the steering knuckle and linkage arms. The 3/4inch bridge reamer is not a drill, it just aligns the reamer with a pre-drilled hole. If you need to enlarge the hole to 3/4inch. There must be an existing hole first and then reamed to 3/4inch. Commonly used in , construction, steel and automotive truck trailer industries, our 3/4inch reamer bits are suitable for use on steel, metal, alloy aluminum, brass, plastic, iron, nickel, copper, cast iron and more. Three-point shank Two symmetrically placed flat surfaces provide reliable grip for portable electric and pneumatic tools Please note:There is a slight color difference or difference in kind, it does not affect the use, please do not mind, thank you! Colour:As Shown Material:steel Package Contents: 1 * Drill Bridge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.